Alright, bookmark this entire thing:
javascript:{void(term=prompt('Enter keywords to find a song with Google:',''))} if(term) location.href='http://www.google.com/search?num=100&hl=en&lr=&ie=UTF-8&safe=off&q=%3Fintitle%3Aindex.of%3F+'+escape(term)

Then go to it. It'll ask you for the search. You get the best results with "mp3 (song title)". Find what you want that way.